异向啮合型双螺杆捏合机转子型线演化及其混合性能  

Rotor Profiles Evolutionary Design and Evaluation of the Mixing Performance for Intermeshing Counter-rotating Twin-screw Kneader

作　　者：魏静[1] 梁新龙[1] 陈大兵[1] 杨玉良[1] 周东明[1] 

机构地区：[1]大连理工大学精密与特种加工教育部重点实验室,大连116024

出　　处：《机械工程学报》2014年第15期34-44,共11页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(50905023;51275553)

摘　　要：针对当前各种不同类型异向啮合型双螺杆捏合机转子型线数学模型表达不一、性能优化及对比困难等问题,建立异向啮合型双螺杆捏合机转子型线设计的统一数学模型,改变阴阳转子头数及其他设计参数,演化得到包括目前常用异向啮合型螺杆转子在内的多种转子端面型线;采用粒子示踪法对几种不同典型螺杆转子流道中的动态混合过程进行研究,对表征螺杆混合性能包括分布性混合和分散性混合的参数指标,如停留时间分布密度函数、分离尺度、拉伸速率、剪切速率等进行对比分析。研究结果表明:差速啮合型双螺杆捏合机分布性混合能力优于传统异向等速啮合型双螺杆捏合机,传统异向等速啮合型双螺杆捏合机分散性混合能力优于差速双螺杆捏合机。研究结果可为双螺杆捏合机螺杆转子的型线选择以及性能优化提供数据依据。In order to solve the expressions of mathematical model, performance optimization and comparison among all kinds of different types of rotor profiles of intermeshing counter-rotating twin-screw kneader, a unified mathematical model for the design of different rotor profiles is established. When changing the teeth number of female and male rotors and other design parameters, a series variety of screw rotor profiles, including those commonly used rotor profiles, can be obtained by evolution method. The visual simulation of dynamic mixing process for a high viscosity non-Newtonian fluid in the flow channel of several typical screw rotors with particle tracer method is implemented. To represent the mixing performance of rotors including distributive and dispersive mixing, contrastive analysis for some parameters, such as residence time distribution density function, separation scale, rate of extension and rate of shear, etc., are carried out. The results show that the distributive mixing ability of differential twin-screw kneaders is better than that of traditional intermeshing counter-rotating twin-screw kneaders, the dispersive mixing ability of traditional intermeshing counter-rotating twin-screw kneaders is superior to which of differential twin-screw kneaders. The results provide a data basis for the selection of rotor profiles and optimization of performance of intermeshing counter-rotating twin-screw kneader.

关 键 词：转子型线 演化设计 分布性混合 分散性混合 

分 类 号：TH113[机械工程—机械设计及理论]